​The principle of vacuum glass lifters comes from octopus

The principle of vacuum glass lifters comes from octopus
 It is said that a cargo ship loaded with North Korean precious porcelain sank in the Japanese Sea in the last century. Although the precise location of the ship was known, the divers could not dive so deep, so they turned to the octopus... Like squid, Octopus belongs to cephalopods. Because its feet grow on top of its head. Octopus has eight long feet, like eight ribbons, so some people call it Octopus. Actually, octopus is not a fish, but a kind of shellfish. Octopus feet have strong suction cups, usually hobby utensils, like hiding in them, can not be absorbed. People take advantage of this eccentricity and benefit a lot.            

In Crete, Greece, a thick layer of coal accumulated on the seabed due to frequent loading and unloading of coal ships. Fishermen often catch octopus, tied to a long rope, throw it into the sea, let the octopus go to the bottom of the sea to catch the coal, and then pull the rope up, the coal will be fished up. Octopus catch coal by foot glass lifters, the structure of glass lifters are similar to the cupping used by people. The burning substance in the cupping consumes the oxygen in the cupping tank, which causes the pressure difference inside and outside the cupping tank. This is the reason why the cupping has suction. Octopus uses muscle contraction to discharge water from the suction cup, resulting in pressure difference between the suction cup and suction. Octopus glass lifters have strong adsorption capacity, sometimes even to absorb coal 20 times their own weight.            
 At the beginning of the article, it is the glass lifters on the foot of octopus that is used to salvage porcelain from Japanese sunken ship. People tie the octopus to a string and throw it into the sea. When it sinks to the bottom of the sea, the octopus lies down looking for a can. Subsequently, people pulled up the rope, stubborn octopuses died to absorb the utensils do not put, so one by one valuable porcelain was pulled up. The octopus's powerful feet and glass lifters are its defensive tools. In the ocean, animals of the same size suffer, and even the largest and best-equipped shrimp is inevitably the victim of octopus. It is said that the big octopus from the North Pacific Ocean, whose feet are 3 meters long, is more or less dangerous for divers to touch it; it can even reach its feet on the boat and pull the boat over! Octopuses are ferocious, but they take good care of their children. In order to protect their  own eggs, Octopus often sits on the eggs, must not leave, do not eat or drink, in order to ensure the safe birth of the next generation. Interestingly, when octopuses rest, they always leave one or two long feet on duty. The long foot keeps turning. If it touches the enemy, it will jump up and run away. Octopus also has a set of landing skills across the border. Geely Patrick, a scientist, once witnessed this: one day, he brought a bucket full of Octopus into his study to let the guests watch. While waiting for the guests, he was absorbed in reading. Suddenly, he heard a loud noise. The octopus in the bucket went out of  the bucket, climbed up the bookshelf and pushed down a thick book.            

The reason why Octopus glass lifters produce great attraction has long been used to develop tools and machines. Common plastic  hanger hook such as vacuum glass lifters. This kind of plastic glass lifters can be firmly absorbed by pressing it on glass or flat board and extruding air from it. A small clothes hook can hold the weight of an overcoat. In industry, people use this principle to make a vacuum crane. This kind of crane replaces the hook of ordinary crane with suction cup. When working like octopus, the boom with suction cup is aimed at the smooth part of the lifting object, and the lifting object can be firmly grasped. The crane has been used abroad to lift cement prefabricated panels weighing up to 30 tons.